Yukawa Motosenmu no Otakara Sagashi (Yukawa's Treasure Hunt) has been translated into English.
We can thank SnowyAria, EsperKnight and Mr. Nobody for this translation. Rom was patched using Universal Dreamcast Patcher from Derek Pascarella.
From the readme file:
This version of the game comes with VMU game containing
a high score of 999, allowing you to copy the VMU game to your own card, then start digging with 999 extra digs! Need a refill of points? Just redownload the VMU game and get back out there! Yukawa's not sleeping in his bed if you don't find his keys!
Attached are patched GDI/CDI files and translated front cover created by myself.